Which of the following represents a domain?

the total hours spent sleeping as you get older

the total amount Brian pays for electricity for the kilowatt-hour that he uses

the space left on a DVD to which Peter is saving files

the number of sunglasses sold at a kiosk tracking total sales profit

Question

Which of the following represents a domain? 

 the total hours spent sleeping as you get older 

 the total amount Brian pays for electricity for the kilowatt-hour that he uses 

 the space left on a DVD to which Peter is saving files 

 the number of sunglasses sold at a kiosk tracking total sales profit

anonymous · Answer

@phi help

phi · Answer

domain means   numbers used in a function to find another number (the range)

phi · Answer

the total hours spent sleeping as you get older 
hours as you get older sounds like the "range"  you put in age and get out hours slept.  So rule this one out...

anonymous · Answer

a is surely correct